Improvement of room temperature ductility for Mo and Fe modified Ti2AlNb alloy

Satoshi Emura, Kaneaki Tsuzaki, Koichi Tsuchiya

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The effect of hot bar rolling and a subsequent annealing in the (B2+α2) two-phase region on the mechanical properties was investigated for the Ti-25Al-14Nb-2Mo-1Fe (mol%) orthorhombic phase base alloy. After this thermomechanical treatment in the (B2+α2) two-phase region, a 'Van Gogh's Sky (VGS)' structure, with wavy and curled bands of spherical α2 precipitates, was obtained. Electron probe micro-analysis (EPMA) examinations indicated that the VGS bands correspond to the Nb and Mo lean regions. The width and spacing of VGS bands varied with thermomechanical treatment conditions (forging temperature before hot bar rolling as well as annealing temperature after the rolling). The samples with the VGS structure exhibited the higher tensile elongation-to-failure at room temperature. The creep resistance at 923K decreased with the existence of the VGS structure. These mechanical properties were affected by the width and spacing of the VGS bands.

Original languageEnglish
Pages (from-to)355-362
Number of pages8
JournalMaterials Science and Engineering A
Volume528
Issue number1
DOIs
Publication statusPublished - Nov 25 2010

Fingerprint

ductility
Ductility
sky
Thermomechanical treatment
room temperature
Annealing
thermomechanical treatment
Mechanical properties
Creep resistance
Electron probe microanalysis
Forging
Temperature
Precipitates
Elongation
spacing
mechanical properties
creep strength
annealing
forging
electron probes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Improvement of room temperature ductility for Mo and Fe modified Ti2AlNb alloy. / Emura, Satoshi; Tsuzaki, Kaneaki; Tsuchiya, Koichi.

In: Materials Science and Engineering A, Vol. 528, No. 1, 25.11.2010, p. 355-362.

Research output: Contribution to journalArticle

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N2 - The effect of hot bar rolling and a subsequent annealing in the (B2+α2) two-phase region on the mechanical properties was investigated for the Ti-25Al-14Nb-2Mo-1Fe (mol%) orthorhombic phase base alloy. After this thermomechanical treatment in the (B2+α2) two-phase region, a 'Van Gogh's Sky (VGS)' structure, with wavy and curled bands of spherical α2 precipitates, was obtained. Electron probe micro-analysis (EPMA) examinations indicated that the VGS bands correspond to the Nb and Mo lean regions. The width and spacing of VGS bands varied with thermomechanical treatment conditions (forging temperature before hot bar rolling as well as annealing temperature after the rolling). The samples with the VGS structure exhibited the higher tensile elongation-to-failure at room temperature. The creep resistance at 923K decreased with the existence of the VGS structure. These mechanical properties were affected by the width and spacing of the VGS bands.

AB - The effect of hot bar rolling and a subsequent annealing in the (B2+α2) two-phase region on the mechanical properties was investigated for the Ti-25Al-14Nb-2Mo-1Fe (mol%) orthorhombic phase base alloy. After this thermomechanical treatment in the (B2+α2) two-phase region, a 'Van Gogh's Sky (VGS)' structure, with wavy and curled bands of spherical α2 precipitates, was obtained. Electron probe micro-analysis (EPMA) examinations indicated that the VGS bands correspond to the Nb and Mo lean regions. The width and spacing of VGS bands varied with thermomechanical treatment conditions (forging temperature before hot bar rolling as well as annealing temperature after the rolling). The samples with the VGS structure exhibited the higher tensile elongation-to-failure at room temperature. The creep resistance at 923K decreased with the existence of the VGS structure. These mechanical properties were affected by the width and spacing of the VGS bands.

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